M9216 Series Electric Spring Return Actuators Installation Instructions
9
5. Use a 1/8 in. (3 mm) flat-blade screwdriver to turn
the zero potentiometer fully CW and the span
potentiometer fully CCW.
6. Apply the minimum (zero point) control signal
required for positioning the actuator at the
minimum position.
7. Monitor DC calibration output. To adjust the
zero potentiometer, turn it CCW until the voltmeter
displays 0 volts or slightly less.
8. Adjust the control signal to the maximum voltage
desired to cause full rotation. (Signals greater than
10 volts have no further effect.)
9. Monitor calibration output at Terminals 1 and 3.
Adjust the span potentiometer CW to increase the
calibration output to 10 volts.
10. Verify that the actuator is properly calibrated by
adjusting the control signal to the minimum and
maximum levels.
Example for a zero of 3 VDC and a span of 5 VDC:
a. Apply a 3-volt control signal to the actuator,
and turn the zero potentiometer CCW until the
calibration output at Terminal 3 is 0 volts.
b. Apply maximum voltage. (In this case, it is
8 VDC, which results in a span of 5 volts.)
c. Monitor calibration output at Terminal 3, and
adjust the span potentiometer CW until
10 volts is reached.
Note:
Mechanical movement is not immediate due to
a delay in the actuator’s response to the control signal.
Auxiliary Switches (xGC Models)
The xGC models have two built-in auxiliary switches,
which may be set for any angle between 0 and 90°
(factory set for 10 and 80°) using either an input signal
or the manual crank. (Refer to the
Technical Data
section for auxiliary switch ratings.)
The following procedures serve as examples to
change the position of the auxiliary switch angles.
Switch S1
To change the angle of Switch S1 to 20°, refer to
Figure 14 and proceed as follows:
Position
Indicator
Plunger
Manual
Crank
CCW
90°
Nodule Guides
(10° Increments)
Edge of
Switch S1
Edge of
Switch S2
0°
CCW
Figure 14: Switch Angle Settings
1. Insert the manual crank into the manual override
gear.
2. Push in and turn the manual crank CW. Using the
0 to 90° nodule guides, rotate the coupler until the
position indicator is at 20°.
3. Rotate Switch S1 CCW, aligning the edge of the
switch with the plunger until the plunger rises. (See
Figure 14.)
Note:
The normally closed contact closes, and the
normally open contact opens. (See Auxiliary Switches
in Terminal Block 2 from Figure 8.)
Switch S2
To change the angle of Switch S2 to 70°, refer to
Figure 14 and proceed as follows:
1. Push in and turn the manual crank CW. Using the
0 to 90° nodule guides, rotate the coupler until the
position indicator is at 70°.
2. Rotate Switch S2 CCW, aligning the edge of the
switch with the plunger until the plunger rises. (See
Figure 14.)
Note:
The normally closed contact opens, and the
normally open contact closes. (See Auxiliary Switches
in Terminal Block 2 from Figure 8.)
3. Turn the manual crank CW to release the spring,
and remove it. (The actuator will spring return the
coupler to the 0° position.)
4. Replace the actuator cover, and return the manual
crank to its original position on the actuator cover.
Repairs and Replacement
Field repairs must not be made. For a replacement or
an accessory, refer to the
Ordering Information
section
in the
M9216 Series Electric Spring Return Actuators
Product Bulletin (LIT-2681068).